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path: root/sys/netinet/tcp_stacks/sack_filter.c
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* Remove all trailing white space from the BBR/Rack fold. BitsRandall Stewart2020-02-121-44/+44
| | | | | | | left around by emacs (thanks emacs). Notes: svn path=/head/; revision=357815
* This commit is a bit of a re-arrange of deck chairs. ItRandall Stewart2019-12-171-0/+5
| | | | | | | | | | | | | | gets both rack and bbr ready for the completion of the STATs framework in FreeBSD. For now if you don't have both NF_stats and stats on it disables them. As soon as the rest of the stats framework lands we can remove that restriction and then just uses stats when defined. Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D22479 Notes: svn path=/head/; revision=355859
* This commit adds BBR (Bottleneck Bandwidth and RTT) congestion control. ThisRandall Stewart2019-09-241-33/+133
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | is a completely separate TCP stack (tcp_bbr.ko) that will be built only if you add the make options WITH_EXTRA_TCP_STACKS=1 and also include the option TCPHPTS. You can also include the RATELIMIT option if you have a NIC interface that supports hardware pacing, BBR understands how to use such a feature. Note that this commit also adds in a general purpose time-filter which allows you to have a min-filter or max-filter. A filter allows you to have a low (or high) value for some period of time and degrade slowly to another value has time passes. You can find out the details of BBR by looking at the original paper at: https://queue.acm.org/detail.cfm?id=3022184 or consult many other web resources you can find on the web referenced by "BBR congestion control". It should be noted that BBRv1 (which this is) does tend to unfairness in cases of small buffered paths, and it will usually get less bandwidth in the case of large BDP paths(when competing with new-reno or cubic flows). BBR is still an active research area and we do plan on implementing V2 of BBR to see if it is an improvement over V1. Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D21582 Notes: svn path=/head/; revision=352657
* Regularize the Netflix copyrightWarner Losh2019-02-041-3/+1
| | | | | | | | | | | | | | | Use recent best practices for Copyright form at the top of the license: 1. Remove all the All Rights Reserved clauses on our stuff. Where we piggybacked others, use a separate line to make things clear. 2. Use "Netflix, Inc." everywhere. 3. Use a single line for the copyright for grep friendliness. 4. Use date ranges in all places for our stuff. Approved by: Netflix Legal (who gave me the form), adrian@ (pmc files) Notes: svn path=/head/; revision=343755
* This commit brings in a new refactored TCP stack called Rack.Randall Stewart2018-06-071-0/+706
Rack includes the following features: - A different SACK processing scheme (the old sack structures are not used). - RACK (Recent acknowledgment) where counting dup-acks is no longer done instead time is used to knwo when to retransmit. (see the I-D) - TLP (Tail Loss Probe) where we will probe for tail-losses to attempt to try not to take a retransmit time-out. (see the I-D) - Burst mitigation using TCPHTPS - PRR (partial rate reduction) see the RFC. Once built into your kernel, you can select this stack by either socket option with the name of the stack is "rack" or by setting the global sysctl so the default is rack. Note that any connection that does not support SACK will be kicked back to the "default" base FreeBSD stack (currently known as "default"). To build this into your kernel you will need to enable in your kernel: makeoptions WITH_EXTRA_TCP_STACKS=1 options TCPHPTS Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D15525 Notes: svn path=/head/; revision=334804